Intramolecular Conjugate Addition of Alkenyl and Aryl Functions to Enones Initiated by Lithium−Iodine Exchange
摘要:
[GRAPHICS]Treatment of each of the substrates 20-26, 29, and 46-48 with t-BuLi in THF, in the presence of HMPA and TMSCl, provides good-to-excel lent yields of the intramolecular conjugate addition products 30-36, 37, and 49-51, respectively.
Cu(I)-Mediated Intramolecular Conjugate Addition of Alkenyltrimethylstannane Functions to α,β-Unsaturated Ketones: A Convenient Preparation of Functionalized cis-Fused Bicyclo[4.3.0]non-8-en-3-ones and Bicyclo[3.3.0]oct-6-en-3-ones
作者:E Piers
DOI:10.1016/s0040-4020(00)00131-9
日期:2000.4.28
A new copper(I)-mediated method for effecting intramolecularconjugateaddition of alkenyl functions to α,β-unsaturated ketone systems is reported. Treatment of the substrates 14, 15, 19–21, 22 and 23 with 2.5 equiv. of CuCl in DMF at room temperature affords excellent yields of the corresponding bicyclic ketones 24, 25, 29–31, 32 and 33. On the other hand, treatment of substances 15–18 with CuCN in
Intramolecular Michael Additions: Copper(I) Chloride-Mediated Conjugate Addition of Vinyltrimethylstannane Functions to .alpha.,.beta.-Unsaturated Ketones
作者:Edward Piers、Ernest J. McEachern、Patricia A. Burns